Drill-chuck for v-shank drills



Patented June I3, |899.

No. 626,84l.

c. o. MUEHLBERG. DRILL CHUCK FOR V-SHANK DRILLS.

(Application led Jan. 25, 1899,)

No Model.)

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UNITED STATES PATENT EEICE.

CARL OSVALD MUEHLBERG, OF EAST PITTSBURG, PENNSYLVANIA.

DRILL-CHUCK FOR V-SHANK DKRILLS.

SPECIFICATION forming part of Letters Patent No. 626,841, dated June 13,1899.

Application filed January 25, 1899.

T0 @ZZ whom it' may 0071/007172,.-

Be it known that I, CARL OswALD MUEHL- BERG, a resident of EastPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a newand useful Improvement in Drill-Chucks forV-Shank Drills;and I do hereby declare the following to be a full, clear, and exactdescription thereof.

My invention relates to drill-chucks, and more particularly to thatstyle of chucks which are adapted to receive and hold drillshanks withV-shaped grooves therein.

The object of my invention is to provide a form of drill-chuckwhich willbe simple'and durable and which will act to bind the drillshank securelytherein. i

To these ends my invention comprises .the

novel features hereinafter set forth in thel claim.

To enable others skilled in the art to make and use my invention, I willdescribe the same more fully, referring to the accompanying drawings, inwhich- Figure l is a view of my improved drillchuck with the drillsecured therein. Fig. 2 is a like view, the sleeves and clamps beingshown in section. Fig. 3 is a perspective View of the body portion ofthe chuck. Fig. It is a perspective view of the clamping-jaws. Fig. 5 isa sectional view of the drill-shank and clamping-jaws on line 5 5, Fig.2. Fig. G is a perspective view of the sleeve.

Like letters of reference indicatelike 'parts in each of the views.

In the drawings the letter ct represents the body of the chuck, with thetailpiece h, projecting out therefrom, adapted to enter the ordinarysocket in the spindle of the drillingmachine lathe or other device. Thebody portion ct has the seats o c formed therein, with the web c2separating said seats. The clamping-jaws d d are adapted to fit withint-he seats c c', respectively, the outer portions d2 of saidclamping-jaws being V-shaped in cross-section and having the taperingfaces d3.

As stated, the clamping-jaws d CZ it within the seats c c in the bodyportion a, while a spring e, passing through an opening in the web o2,enters the seats e in the clampingjaws d d. The action of this springtends to force the clamping-jaws apart.

serial No. 703,370. (No modem Inclosing the clamping -jaws d d is thesleeve f, said sleeve being internally threaded at one end thereof andengaging the threaded portion a. of the body a.. The opposite end of thesleeve f has the conical'inner face f ,which when the sleeve is drawn uptight engages the tapering portions d3 of the clamping-jaws d d.

The sleeve f is provided with the polygonal face f2, by means of whichthe sleeve can be grasped by a wrench or other tool. The sleeve f isfurther provided with the roughened portionf, by means of which thesleeve is turned to clamp the drill within the socket.

The drill g is of the ordinary construction,

and its shank is provided with the V-shaped grooves g g2,into which theV-shaped portions d2 of the clamping-jaws d d' enter, as shown in Fig.5.

The body portion 'a has the bearing a2, encircled by the collar h. Thiscollar h has the lugs h thereon, adapted to enter seats in the socket ofthe drilling-machine, with which the tail portion b engages. This collarh, engaging said seats in this manner, acts to relieve the twistingstrain on the tail portion b when the drill is in operation.

When lny improved drill-chuck is in use, the shank of the drill isinserted into the space between the clamping-jaws so that the jaws enterthe V-shaped grooves in said drill, whereupon the sleevef is turned, andas said sleevel is turned the conical inner face f of saidsleeve,together with the entire inner face of said sleeve, engages theclamping-jaws for their full length and acts to force the said j aws fortheir entire length toward each other, so that the V-shaped portions (Z2of said clamping-jaws are forced by a substantially parallel movementinto the V-shaped groovesof the drill and act to bind the same securelyin place. By this construction drills with different-sized shanks may beinserted within the chuck, and by turning the sleeve the said jaws willbe forced toward each other and act to clamp4 the drill. Saidclampingjaws are free to move inwardly for their entire length by asubstantially parallel move- Ament, and as the spring is contracted saidjaws move inward at all points. The clamping-jaws do not bind on thedrill simply at one point, but for the full length of the V- IOO apart,said clampingjaws having taperingl faces at one end thereof, and arotatable sleeve adapted to engage said body portion, said sleeve havingconical inner faces adapted to en gage the tapering faces of saidclampingr-jaws, substantially as set forth.

In testimony whereof I, the said CARL Os- WALD MUEHLBERG, have hereuntoset my hand.

CARL OSWALD MUEHLBERG. Vitnesses:

RoBT. D. TOTTEN, ROBERT C. TOTTENi

